News tagged with chromatography

As the holidays draw near, many of us will hop on a plane to visit friends and family – or just get away from it all. Some will be subjected to a swab at the airport to test clothes and baggage for explosives. ...

A University of Texas at Arlington researcher has received a three-year, $400,369 National Science Foundation grant to build a handheld device that could analyze a person's breath to reveal whether certain ...

(Phys.org) —A team of researchers with members from Mexico, the U.S. and the U.K. has found evidence that suggests the people living in ancient Teotihuacan made an alcoholic beverage named pulque as early ...

A UT Arlington chemistry professor, renowned for his work in the area of chemical separations, is leading an effort to find a more accurate way to measure water content in pharmaceuticals – a major quality issue for drug ...

(Phys.org) —Using nanodot technology, Berkeley Lab researchers have demonstrated the first size-based form of chromatography that can be used to study the membranes of living cells. This unique physical ...

Preparing semiconductor quantum dots is sometimes more of a black art than a science. That presents an obstacle to further progress in, for example, creating better solar cells or lighting devices, where ...

(Phys.org) —Chemical researchers D K Abdullah and Ahmad Shamsuri of University Putra Malaysia have found a way to synthesize vanillin from sawdust in an environmentally friendly way. In their paper they've ...

Researchers looking to isolate individual proteins from complex environments usually turn to chromatography, a technique where mobile solutions of biomolecules flow through columns packed with solid, porous ...

(Phys.org) —Iron is a critical part of many biological processes; however, it is often not biologically available or it can be toxic in high quantities. So, biological systems have developed intricate methods ...

(Phys.org) —An old, somewhat passé, trick used to purify protein samples based on their affinity for water has found new fans at the National Institute of Standards and Technology, where materials scientists ...

(Phys.org) —A group of researchers from Sweden have provided further evidence that illegal drugs can be detected in the breath, opening up the possibility of a roadside breathalyzer test to detect substances such as cocaine, ...

Seaweeds are not only tasty, but they are a source of nutrients that could be beneficial for health and wellbeing. And like terrestrial plants, seaweeds also contain significant portions of fibre that reach ...

Chromatography

Chromatography (from Greek χρῶμα chroma "color" and γράφειν graphein "to write") is the collective term for a set of laboratory techniques for the separation of mixtures. The mixture is dissolved in a fluid called the "mobile phase", which carries it through a structure holding another material called the "stationary phase". The various constituents of the mixture travel at different speeds, causing them to separate. The separation is based on differential partitioning between the mobile and stationary phases. Subtle differences in a compound's partition coefficient result in differential retention on the stationary phase and thus changing the separation.

Chromatography may be preparative or analytical. The purpose of preparative chromatography is to separate the components of a mixture for further use (and is thus a form of purification). Analytical chromatography is done normally with smaller amounts of material and is for measuring the relative proportions of analytes in a mixture. The two are not mutually exclusive.